radio.cpp Example File
radio/radio.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
    ** All rights reserved.
    ** Contact: Nokia Corporation (qt-info@nokia.com)
    **
    ** This file is part of the Qt Mobility Components.
    **
    ** $QT_BEGIN_LICENSE:LGPL$
    ** No Commercial Usage
    ** This file contains pre-release code and may not be distributed.
    ** You may use this file in accordance with the terms and conditions
    ** contained in the Technology Preview License Agreement accompanying
    ** this package.
    **
    ** GNU Lesser General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU Lesser
    ** General Public License version 2.1 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.LGPL included in the
    ** packaging of this file.  Please review the following information to
    ** ensure the GNU Lesser General Public License version 2.1 requirements
    ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    **
    ** In addition, as a special exception, Nokia gives you certain additional
    ** rights.  These rights are described in the Nokia Qt LGPL Exception
    ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
    **
    ** If you have questions regarding the use of this file, please contact
    ** Nokia at qt-info@nokia.com.
    **
    **
    **
    **
    **
    **
    **
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    #include "radio.h"

    #include <QtGui>

    Radio::Radio()
    {
        radio = new QRadioTuner;
        connect(radio,SIGNAL(frequencyChanged(int)),this,SLOT(freqChanged(int)));
        connect(radio,SIGNAL(signalStrengthChanged(int)),this,SLOT(signalChanged(int)));

        if(radio->isBandSupported(QRadioTuner::FM))
            radio->setBand(QRadioTuner::FM);
        else {
            qWarning()<<"Currently only works for FM";
            exit(0);
        }

        QWidget *window = new QWidget;
        QVBoxLayout* layout = new QVBoxLayout;
        QHBoxLayout* buttonBar = new QHBoxLayout;
        QHBoxLayout* topBar = new QHBoxLayout;

        layout->addLayout(topBar);

        freq = new QLabel;
        freq->setText(QString("%1 kHz").arg(radio->frequency()/1000));
        topBar->addWidget(freq);

        signal = new QLabel;
        signal->setText(tr("No Signal"));
        topBar->addWidget(signal);

        volumeSlider = new QSlider(Qt::Vertical,this);
        volumeSlider->setRange(0,100);
        qWarning()<<radio->volume();
        volumeSlider->setValue(radio->volume());
        connect(volumeSlider,SIGNAL(valueChanged(int)),this,SLOT(updateVolume(int)));
        topBar->addWidget(volumeSlider);

        layout->addLayout(buttonBar);

        searchLeft = new QPushButton;
        searchLeft->setText(tr("scan Down"));
        connect(searchLeft,SIGNAL(clicked()),SLOT(searchDown()));
        buttonBar->addWidget(searchLeft);

        left = new QPushButton;
        left->setText(tr("Freq Down"));
        connect(left,SIGNAL(clicked()),SLOT(freqDown()));
        buttonBar->addWidget(left);

        right = new QPushButton;
        connect(right,SIGNAL(clicked()),SLOT(freqUp()));
        right->setText(tr("Freq Up"));
        buttonBar->addWidget(right);

        searchRight = new QPushButton;
        searchRight->setText(tr("scan Up"));
        connect(searchRight,SIGNAL(clicked()),SLOT(searchUp()));
        buttonBar->addWidget(searchRight);

        window->setLayout(layout);
        setCentralWidget(window);
        window->show();

        radio->start();
    }

    Radio::~Radio()
    {
    }

    void Radio::freqUp()
    {
        int f = radio->frequency();
        f = f + radio->frequencyStep(QRadioTuner::FM);
        radio->setFrequency(f);
    }

    void Radio::freqDown()
    {
        int f = radio->frequency();
        f = f - radio->frequencyStep(QRadioTuner::FM);
        radio->setFrequency(f);
    }

    void Radio::searchUp()
    {
        radio->searchForward();
    }

    void Radio::searchDown()
    {
        radio->searchBackward();
    }

    void Radio::freqChanged(int)
    {
        freq->setText(QString("%1 kHz").arg(radio->frequency()/1000));
    }

    void Radio::signalChanged(int)
    {
        if(radio->signalStrength() > 25)
            signal->setText(tr("Got Signal"));
        else
            signal->setText(tr("No Signal"));
    }

    void Radio::updateVolume(int v)
    {
        radio->setVolume(v);
    }